CN102454466B - Cylinder cooling apparatus for air-cooled engine - Google Patents
Cylinder cooling apparatus for air-cooled engine Download PDFInfo
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- CN102454466B CN102454466B CN201110317959.4A CN201110317959A CN102454466B CN 102454466 B CN102454466 B CN 102454466B CN 201110317959 A CN201110317959 A CN 201110317959A CN 102454466 B CN102454466 B CN 102454466B
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- cylinder
- periphery wall
- cooling fan
- wall portion
- cooling
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P1/00—Air cooling
- F01P1/02—Arrangements for cooling cylinders or cylinder heads, e.g. ducting cooling-air from its pressure source to cylinders or along cylinders
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B63/00—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices
- F02B63/02—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices for hand-held tools
Abstract
A cylinder cooling apparatus for an air-cooled engine is equipped with a cooling fan provided on one end section of a crankshaft; a pair of pushrod insertion holes for air intake and exhaust valves formed in a cylinder outer circumferential wall section; a fan shroud for covering the cooling fan and for covering the cylinder outer circumferential wall section in which the pushrod insertion holes are formed; a cutout ventilating section formed in the cylinder outer circumferential wall section between the pair of pushrod insertion holes; and tunnel-shaped ventilating holes formed in the cylinder outer circumferential wall section between the pushrod insertion hole disposed on the side of the cooling fan and a cylinder bore and extending from the cylinder outer circumferential wall section on the side of the cooling fan to the cutout ventilating section.
Description
Technical field
The present invention relates to utilize the cylinder cooling apparatus that carries out cooling air cooled engine from the cooling air countercylinder of cooling fan.
Background technique
Form by with suitable forms and will guide the cooling air passway that cylinder or cylinder head are used into from the cooling air of cooling fan, as much as possible the cylinder reaching a high temperature or cylinder head is carried out to evenly cooling various technological schemes and is suggested (for example, with reference to patent documentation 1 to 3).
In addition, by by cylinder tilted configuration, so that the total height of motor is suppressed to be disclosed patent documentation 4 as low cylinder oblique overhead valve engine (OHV).This cylinder oblique overhead valve engine (OHV), form with the cam on the camshaft of cylinder lower, make the Yao Bei Oscillating of cylinder upper moving by tappet and push rod, so that be disposed at the intake valve of cylinder head, the structure that exhaust valve moves up and down, tappet and push rod are disposed at the lower side of the cylinder of inclination.While observing the cylinder of inclination from bent axle one side, the upper side of the cylinder of inclination only has cylinder periphery wall portion to exist, and therefore the thickness of the cylinder periphery wall portion of upper side is so not thick.Otherwise in the lower side of the cylinder tilting, owing to there being push rod etc., it is large that the thickness of cylinder periphery wall portion becomes.Thereby the cylinder of inclination it seems from bent axle one side, the thickness of the structure of cylinder and cylinder periphery wall portion up side and lower side is very different.
Patent documentation 1: Japanese kokai publication hei 10-227254 communique;
Patent documentation 2: Japanese kokai publication hei 06-42347 communique;
Patent documentation 3: Japanese kokai publication hei 07-293238 communique;
Patent documentation 4: TOHKEMY 2000-88057 communique.
In the disclosed cylinder oblique of patent documentation 4 overhead valve engine (OHV), formation can make to flow to along cylinder outer circumferential face from the cooling air of cooling fan the cooling air passway of the opposition side of cooling fan, but in the lower side of the cylinder of configuration push rod etc., the thickness of cylinder periphery wall portion is large, and therefore the cooling effect of cooling air countercylinder is not enough to act on to cylinder internal.
Summary of the invention
Thereby the technical problem to be solved in the present invention is, even provide the thickness of cylinder periphery wall portion large, also can make effectively to act on to the cylinder cooling apparatus of the air cooled engine of cylinder internal from the cooling effect of the cooling air of cooling fan.
In order to solve the problems of the technologies described above, the invention provides the cylinder cooling apparatus of air cooled engine as described below.
That is to say, the cylinder cooling apparatus of air cooled engine of the present invention,, in an end of bent axle, cooling fan is set, with the roughly cylinder periphery wall portion of an orthogonal side of axle direction of described bent axle, be formed on the intake valve that keeps arranged spaced on the axle direction of described bent axle with and the cylinder cooling apparatus of the air cooled engine of the pair of push rods inserting hole used of exhaust valve
Possess the described cooling fan of covering, cover the fan guard of the cylinder periphery wall portion that forms described push rod inserting hole simultaneously,
Make ventilation notch part that cylinder periphery wall portion between described pair of push rods inserting hole forms with
The cylinder periphery wall portion between push rod inserting hole and the cylinder thorax of described cooling fan one side of being disposed at forms, is communicated with to the tunnel-like vent of described ventilation notch part from the cylinder periphery wall portion of described cooling fan one side,
By the cooling air from described cooling fan, guide the cylinder periphery wall portion of the opposition side of described cooling fan into through described tunnel-like vent and ventilation notch part.
In the present invention, flow through owing to forming push rod inserting hole from the cooling air of cooling fan, thickness becomes the inside of large cylinder periphery wall portion, therefore the cooling effect of cooling air can useful effect to cylinder internal, cylinder to high temperature and cylinder head carry out cooling as far as possible equably, and needn't make cooling fan maximize, and therefore can not change the boundary dimension of motor, make it keep compact.
Also can, in the cylinder cooling apparatus of air cooled engine of the present invention, the axle center of described cylinder tilts with respect to substantially vertical direction.
Adopt the present invention, have and the total height of motor can be suppressed for low effect.
Also can, in the cylinder cooling apparatus of air cooled engine of the present invention, the push rod inserting hole that is disposed at described cooling fan one side is the push rod inserting hole that intake valve is used.
Adopt the present invention, fuel supplying device is disposed to cooling fan one side, can utilize countercylinder to carry out the cooling air of cooling low temperature before, effectively carry out cooling to fuel supplying device (vaporizer).
Also can, the cylinder cooling apparatus of air cooled engine of the present invention, also possess and form in the cylinder periphery wall portion between push rod inserting hole and the cylinder thorax of opposition side that is disposed at described cooling fan, the tunnel-like vent of the cylinder periphery wall portion from described ventilation notch part to the opposition side of described cooling fan.
Adopt the present invention, the inside of the cylinder periphery wall portion of the opposition side of cooling fan also has cooling air to flow into, and therefore has and can carry out more equably cooling effect by countercylinder.
Also can, in the cylinder cooling apparatus of air cooled engine of the present invention, described tunnel-like vent by the axis direction of described cylinder and multiple vents of row arrangement form.
In the present invention, tunnel-like vent is divided into many little vents, has the effect of the mechanical strength of avoiding the peripheral part that reduces tunnel-like vent.
Brief description of the drawings
Fig. 1 is the rear view of an example of the air cooled engine that comprises cylinder cooling apparatus of the present invention;
Fig. 2 is the rear view that represents to take off from the air cooled engine shown in Fig. 1 the state of kick-starter (recoil starter) and fan guard;
Fig. 3 is the rear view of wanting portion of cylinder and crankcase in the air cooled engine shown in presentation graphs 2;
Fig. 4 is the IV-IV sectional view of Fig. 3, is the sectional view of additional cooling fan and fan guard;
Fig. 5 observes the cylinder shown in Fig. 3 and the stereogram of wanting portion of crankcase from positively biased side;
A part for the VI-VI section of Fig. 4 is amplified the amplification view representing by Fig. 6;
Fig. 7 is the plan view when the motor of Fig. 6 takes off cylinder head cover.
Symbol description:
1: crankcase;
2: cylinder;
3: cylinder head;
5: bent axle;
7a: the cylinder periphery wall portion in front;
7b: the cylinder periphery wall portion of left bottom;
7c: top-right cylinder periphery wall portion;
7d: the cylinder periphery wall portion at rear;
9: fuel supplying device;
10: cylinder thorax;
14: kick-starter;
17: cold sink;
20: suction port;
23: camshaft;
33: push rod;
40: fan guard;
44: cooling fan;
46: rocking arm;
50: ventilation notch part;
Connect vent at 51: the first;
Connect vent at 52: the second;
54,55,56,57: ventilation recess;
61: oily supply hole;
63: push rod inserting hole;
65: oily return aperture.
Embodiment
Below with reference to Fig. 1～Fig. 7, one example of the forced air cooling type cylinder oblique overhead valve engine (OHV) that comprises cylinder cooling apparatus of the present invention is elaborated.
(motor general structure)
Fig. 1 is the rear view of the forced air cooling type cylinder oblique overhead valve engine (OHV) of watching on the axle direction of bent axle 5.For convenience of description, " front " taking output axial region one side of the bent axle 5 on the axle direction of bent axle 5 as motor, " rear " that cooling fan 44 1 sides of the bent axle 5 on the axle direction of bent axle 5 are motor, with " left " that bent axle 5 side that roughly cylinder 2 tilts in orthogonal direction is motor, " right-hand " that its opposition side is motor describes.
Motor shown in Fig. 1, possesses covering engine main body, utilize the fan guard 40 of multiple bolton on crankcase 1 simultaneously, be installed on the kick-starter 14 of bent axle 5 rearward end and to kick-starter 14 operate use handle 42, be disposed at the top-right fuel tank 11 of fan guard 40, upper left side at fan guard 40, be disposed at the exhaust silencer 12 of front side and on the upper left side of fan guard 40, be disposed at the air-strainer 13 of rear side.Further, the symbol 3 in Fig. 1 is cylinder heads, the 4th, and cylinder head cover, the 8th, oil meter assembly department, 8a is oil meter, the 9th, fuel supplying device (vaporizer).
Fig. 2 is the rear view that represents to take off from the motor shown in Fig. 1 the state of kick-starter 14 and fan guard 40.In Fig. 2, engine main body is formed as upper surface formation cylinder 2 in aggregates and the crankcase 1 in the left side of crankcase 1, and cylinder head 3 and cylinder head cover 4 are sequentially anchored on the structure of cylinder 2 simultaneously.The shaft centre line of cylinder 2 is with respect to the vertical line of the axle core O of the bent axle 5 by approximate horizontal, the angle of the regulation that is tilted to the left (for example angles of inclination of 55～60 degree).By means of the inclination of cylinder 2, the total height of motor can be suppressed for low.The front ends of bent axle 5 is outstanding to outside from crankcase cover (not shown) as output axial region.In the rear end of bent axle 5, cooling fan 44 and flywheel (not shown) can be in aggregatesly installed rotatably.The suction port 20(that the downstream of fuel supplying device 9 is connected in cylinder head 3 is shown in Fig. 6).Near the left side edge portion of the cooling fan 44 of the lower position of fuel supplying device 9, the igniting unit 15 of configuration driven spark plug (not shown).Igniting unit 15 has spark coil 15a and magnet unit 15b.Further, by fuel supplying device 9 being disposed to cooling fan 44 sides, the cooling air that can utilize countercylinder 2 to carry out cooling low temperature before carries out effective cooling to fuel supplying device (vaporizer) 9.
Fig. 3 is the rear view of wanting portion of cylinder 2 and crankcase 1 in the motor shown in presentation graphs 2.In Fig. 3, in crankcase 1, formation can be respectively with bent axle substantially in parallel, rotatably with the bearing of the 2nd balace weight axle of the 1st balace weight axle of axle supporting crankshaft (not shown), upside, downside, camshaft (all not shown) that intake valve/exhaust valve drives use, the recess of use is installed.That is to say, be formed at the large recess 48 of central part of crankcase 1 for bent axle, the recess 48a that upper right forms is for the 1st balace weight axle, the recess 48b that left bottom forms is for the 2nd balace weight axle, and the little recess 48c that the cylinder 2 of left bottom nearby forms supplies with camshaft and uses.There are roughly requirement configuration the 1st balace weight axle and the 2nd balace weight axle of the phase difference of 180 degree according to the axle core O2 of the axle core O1 of the 1st balace weight axle and the 2nd balace weight axle around the axle core O of bent axle 5.In other words,, at the axle direction of bent axle, the axle core O of bent axle, axle core O1, the O2 of two balace weight axles are roughly positioned on a straight line L.In this case, three axle core O, O1, O2 above-mentioned straight line L are side by side by the axle core O of bent axle, the angle (for example 19 angles of inclination of spending) specify than the clockwise deflection of straight line of shaft centre line that is roughly orthogonal to cylinder 2.Like this, the axle core O1 of the 1st balace weight axle and the axle core O2 of the 2nd balace weight axle set near the substantially vertical line near the axle core O by bent axle 5 on left and right directions.
(structure of the Overhead valve of motor)
The motor that comprises cylinder cooling apparatus of the present invention, that cylinder 2 is with respect to the Vertical direction oblique engine with inclined cylinder of square neck to left down, be the top that intake valve, exhaust valve (not shown) are disposed at cylinder 2, the push rod 33(that drives into valve, exhaust valve is shown in Fig. 6 simultaneously) be disposed at the Overhead valve (overhead valve(OHV) of the side wall portion of cylinder 2) h type engine h.Describe below with reference to Fig. 5,6,7 pairs of Overhead valve structures.
Fig. 5 observes the cylinder 2 shown in Fig. 3 and the stereogram of wanting portion of crankcase 1 from positively biased side (tiltedly front).Fig. 6 is the valve actuation structure in order to understand better Overhead valve h type engine h, a part for the VI-VI section of Fig. 4 is amplified to the amplification view representing.Again, Fig. 7 is the plan view that represents to take off from the cylinder head 3 of Fig. 6 the state of cylinder head cover 4.
Fig. 5 is illustrated in crankcase 1 and the cylinder 2 under the state of the crankcase cover (not shown) being installed with on the surface in the front of taking off crankcase 1.As shown in Figure 5, the periphery wall portion of cylinder 2 is made up of these four cylinder periphery wall portions of the cylinder periphery wall 7d of portion at the cylinder periphery wall 7a of portion in front, the cylinder periphery wall 7b of portion of left bottom, the top-right cylinder periphery wall 7c of portion, rear.In the cylinder periphery wall 7b of portion of left bottom, the lower portion of pair of push rods inserting hole 63 forms with the state of keeping at a distance on fore-and-aft direction.In order to ensure the space that pair of push rods inserting hole 63 use are set, other cylinder periphery walls of Thickness Ratio 7a of portion of the cylinder periphery wall 7b of portion of left bottom, 7c, 7d are thick.Again, the upper portion of pair of push rods inserting hole 63 is also formed at cylinder head 3(with the state of keeping at a distance on fore-and-aft direction and is shown in Fig. 6).Again, the upside female threaded hole 29 of right back nearby form oily supply hole 61, by this oil supply hole 61, offer to oily mist Rocker arm 4 6(and be shown in Fig. 6), intake valve/exhaust valve (not shown) etc., it is lubricated.Offer Rocker arm 4 6(and be shown in Fig. 6) etc. oil, flow into pair of push rods inserting hole 63, by the oily return aperture 65 shown in Fig. 6, return to the oil sump (not shown) of crankcase 1 bottom from the lower portion of push rod inserting hole 63.
As shown in Figure 6, in pair of push rods inserting hole 63, configuration is held in the intake valve of cylinder head 3, the pair of push rods 33 that exhaust valve (not shown) drives to propping up.The lower end surface of this pair of push rods 33 contacts with each cam 25 of camshaft 23 respectively by tappet 35.By means of this cam 25, push rod 33 moves up and down on its axle direction.
As shown in Figure 7, on cylinder head 3, shake arranges a pair of Rocker arm 46 freely, in the upper end portion of chimeric pair of push rods 33 respectively, one end of these Rocker arm 4s 6.And by the valve spring 26 of energizing to valve-closing direction, be held in the intake valve of cylinder head 3, the upper end of exhaust valve (not shown) contacts respectively the other end of two Rocker arm 4s 6.As shown in Figure 6, the cam driving gear 36 of camshaft 23 be roughly parallel to the bent axle 5(that camshaft 23 configures and be shown in Fig. 2) crankshaft gear (not shown) engage, the requirement that is 2 according to reduction speed ratio, is shown in Fig. 2 by camshaft 23 with bent axle 5() be connected.Thereby camshaft 23 is shown in Fig. 2 with bent axle 5() 1/2 rotating speed rotation of rotating speed, drive into valve in the timing of regulation, exhaust valve (not shown) opens and closes.Again, return to Fig. 7, at the upper surface of cylinder head 3, screw thread is set the spark plug mount inlet 22 of spark plug (not shown) use is installed, at leading flank and the trailing flank of cylinder head 3, relief opening 21 and suction port 20 are set respectively.Further, because the trailing flank of cylinder head 3 possesses suction port 20, rear side, cooling fan 44(is shown in Fig. 2) the push rod inserting hole 63 of a side configuration is the push rod inserting hole that intake valve is used.
As shown in Figure 5, the corner portion of the top-right periphery wall 7c of portion mono-side of cylinder 2, be separately positioned on the upwardly extending upside female threaded hole 29 in side with shaft centre line 30 almost parallels of cylinder 2, in the corner portion of the 7b of periphery wall portion mono-side of the left bottom of cylinder 2, be separately positioned on the side upwardly extending downside female threaded hole 29a with shaft centre line 30 almost parallels of cylinder 2.In order to snap in the axle collar (not shown) of location use on the top of downside female threaded hole 29a, form the opening diameter structure larger than the opening diameter of upside female threaded hole 29 of downside female threaded hole 29a.Again between pair of push rods inserting hole 63, be also arranged on the upwardly extending central female threaded hole 39 in side with shaft centre line 30 almost parallels of cylinder 2.Thereby, five female threaded holes 29,29a, 39 are being set on cylinder 2.The tapped hole that female threaded hole 29,29a, 39 bottom form is general, is screwed into construction bolt 28(and is shown in Fig. 7) screw thread.As shown in Figure 6, engine main body is being overlapped in cylinder head 3 under the state of cylinder 2 across pad 19, two the upside female threaded holes 29, two the downside female threaded hole 29a that arrange in the corner portion of cylinder 2 7b of left bottom periphery wall portion mono-sides that arrange in the corner portion of cylinder 2 7c of upper right periphery wall portion mono-sides, on the central female threaded hole 39 arranging between push rod inserting hole 63, be screwed into respectively construction bolt 28(and be shown in Fig. 7), with this, cylinder head 3 and cylinder 2 are linked into an integrated entity.And cylinder head cover 4 utilizes construction bolt (not shown) to be installed on cylinder head 3.As shown in Figure 5, in the cylinder thorax 10 forming, insert sliding freely piston (not shown) at cylinder 2 central parts, this piston is shown in Fig. 2 by connecting rod with bent axle 5() be connected.
(cooling structure of motor)
Said cylinder oblique overhead valve engine (OHV) comprises cylinder cooling apparatus of the present invention, describes below with reference to the structure of Fig. 3,4,5 countercylinder cooling units.Further, Fig. 4 is the IV-IV sectional view of Fig. 3, is the sectional view that adds cooling fan 44 and fan guard 40 in the structure of Fig. 3.
As shown in Fig. 3 and 5, multiple cold sinks 17 of formation in aggregates respectively on the cylinder periphery wall 7d of portion at the cylinder periphery wall 7a of portion, the cylinder periphery wall 7b of portion of left bottom, the top-right cylinder periphery wall 7c of portion and the rear in the front of cylinder 2.Multiple cold sinks 17 mutually keep interval to extend to form on the roughly orthogonal direction of the shaft centre line 30 of cylinder 2.The cylinder periphery wall 7d of portion at the cylinder periphery wall 7a of portion in front, the cylinder periphery wall 7b of portion of left bottom, the top-right cylinder periphery wall 7c of portion and rear, possesses respectively the ventilation recess 54,55,56,57 of multiple gap portions that are formed at two adjacent cold sinks 17.
In the rear part of the cylinder periphery wall 7b of portion of the left bottom of the cylinder 2 of Fig. 3, be formed on front and back upwardly extending tunnel-shaped first and connect vent 51 and second and connect vent 52.In the rear part of the cylinder periphery wall 7b of portion of left bottom, be arranged on the push rod inserting hole 63 that the upwardly extending intake valve of upper and lower is used, therefore can be not be positioned at cooling fan 44(and be shown in Fig. 2) the push rod inserting hole 63 used of the intake valve of a side hinders ground mutually, the first perforation vent 51 and second is connected to vent 52 and is formed at the gap portion between push rod inserting hole 63 and the cylinder thorax 10 that intake valve uses.First connect vent 51 and second connect multiple tunnel-like vents of forming of vent 52 on the axis direction of cylinder 2 up and down and row arrangement.Form owing to tunnel-like vent being divided into multiple little vents 51,52, can avoid reducing the mechanical strength of tunnel-like vent peripheral part.
As shown in Fig. 4 and 5, at the cylinder periphery wall 7b of portion of left bottom, the ventilation notch part 50 that forming section is cut.This ventilation notch part 50 is by the gap portion between pair of push rods inserting hole 63 being cut on above-below direction to formation, mutually hinders avoiding with female threaded hole 39.Again, this ventilation notch part 50, as shown in Figure 4, crosses push rod inserting hole 63, further to cylinder thorax 10 toward right-hand incision.And the total thickness of the cylinder periphery wall 7b of portion of left bottom, although thicker than other cylinder periphery walls 7a of portion, 7c, 7d, roughly the same at the thickness of the thickness of the cylinder periphery wall 7b of portion of the left bottom of ventilation notch part 50 and other cylinder periphery walls 7a of portion, 7c, 7d.
As shown in Fig. 4 and 5, the lower portion of the upper ventilation notch part 50 forming of the cylinder periphery wall 7b of portion of left bottom, connects vent 52 by tunnel-shaped the first perforation vent 51 and second and is shown in Fig. 3,4 with the space 59(of the cylinder periphery wall 7d of portion mono-side at rear) be communicated with.
The mobile of cooling air below with reference to the periphery of Fig. 4 countercylinder 2 describes, and the arrow in Fig. 4 represents flowing of cooling air.
In cylinder 2, the roughly whole surface of the cylinder periphery wall 7d of portion at the roughly whole surface of the cylinder periphery wall 7b of portion of left bottom, the roughly rear side half of the top-right cylinder periphery wall 7c of portion and rear, is covered by fan guard 40 respectively.A side of the cylinder periphery wall 7d of portion in the wings, the cooling air that flows to front from rear is formed by cooling fan 44 and fan guard 40.Flow to the major part of the cooling air in front from rear, run into the cylinder periphery wall 7d of portion at rear, along the ventilation recess 57 of the cylinder periphery wall 7d of portion at rear to right-hand and left shunting, carry out cooling to the cylinder periphery wall 7d of portion at rear.
A part for the cooling air of shunting toward left connects vent 52 by the first perforation vent 51 and second and guides ventilation notch part 50 into, utilize this cooling air in the cylinder periphery wall 7b of portion of left bottom, till the part of the push rod inserting hole 63 at the thick wall part at the rear of cylinder thorax 10 and rear is carried out effective cooling.But, first connects vent 51 and second connects vent 52 and divides the venting channels that carries out cooling cooling air to work in the inside portion of the cylinder periphery wall 7b of portion of other cylinder periphery walls 7a of portion, 7c, left bottom that 7d thickness is large as a comparison, therefore can carry out as far as possible equably cooling to the cylinder of high temperature 2 and cylinder head 3.At this moment also by the cooling air of shunting to left, the spark coil 15a(of igniting unit 15 is shown in to Fig. 2 again) carry out cooling.Guide the cooling air of ventilation after notch part 50 into, with the mobile cooling air interflow of the ventilation recess 55 at the rear of the cylinder periphery wall 7b of portion along left bottom.Cooling air behind interflow, forwards flows along the ventilation recess 55 in the front of the cylinder periphery wall 7b of portion of left bottom, the front part of the cylinder periphery wall 7b of portion to left bottom divide carry out cooling.The cylinder periphery wall 7b of portion to left bottom carries out cooled cooling air, and the cylinder periphery wall 7a of portion to front in forwards mobile process carries out cooling.
Again, in the top-right cylinder periphery wall 7c of portion mono-side, the major part that runs into the cooling air of the backward right shunting of the cylinder periphery wall 7d of portion at rear, forwards flows along the ventilation recess 56 of the top-right cylinder periphery wall 7c of portion, carries out cooling to the top-right cylinder periphery wall 7c of portion.The top-right cylinder periphery wall 7c of portion is carried out to cooled cooling air cylinder periphery wall 7a of portion to front in forwards mobile process to carry out cooling.
Further, although example of the present invention is had been described in detail, the invention is not restricted to above-mentioned example, can have various changes.That is to say, in above-mentioned example, although countercylinder 2 is illustrated with respect to the Vertical direction engine with inclined cylinder that square neck is oblique to left down, the present invention also goes for the motor of the type that cylinder 2 do not tilt.
As other examples of the present invention, also can, in the front part of the cylinder periphery wall 7b of portion of the left bottom of cylinder 2, also be formed on the upwardly extending tunnel-like vent in front and back again.The push rod inserting hole 63 of namely using with the exhaust valve in front does not hinder ground mutually, gap portion between push rod inserting hole 63 and the cylinder thorax 10 that the exhaust valve that is formed at front at the upwardly extending tunnel-like vent in front and back is used, by tunnel-like vent, can be communicated with the space and ventilation notch part 50 of the cylinder periphery wall 7a of portion mono-side in front.Consequently, a part of introducing the cooling air after ventilation notch part 50 flows through this tunnel-like vent, with this in the cylinder periphery wall 7b of portion of left bottom, till the part of the push rod inserting hole 63 that the thick wall part in the front of cylinder thorax 10 and the exhaust valve in front are used is carried out effective cooling, can further make cylinder 2 evenly cooling.Further, this tunnel-like vent also can be formed as on the axis direction of cylinder 2 up and down and the multiple little vent of row arrangement.
As mentioned above, the cylinder cooling apparatus of air cooled engine of the present invention has excellent effect as described below.
(1) by the cylinder periphery wall portion from cooling fan side is formed to the cylinder periphery wall portion push rod inserting hole and the cylinder thorax of cooling fan one side configuration to the tunnel-like vent of ventilation notch part, flow through the inside that becomes large cylinder periphery wall portion because forming push rod inserting hole thickness from the cooling air of cooling fan, can make the cooling effect of cooling air effectively act on to cylinder internal, cylinder to high temperature and cylinder head carry out cooling as far as possible equably, and needn't make cooling fan maximize, therefore can not change the boundary dimension of motor, make it keep compact.
(2), by cylinder is tilted with respect to Vertical direction, the total height of motor can be suppressed in reduced levels.
(3), by fuel supplying device being disposed to cooling fan one side, the cooling air that can utilize countercylinder to carry out cooling low temperature before carries out effective cooling to fuel supplying device (vaporizer).
(4) also form tunnel-like vent by the cylinder periphery wall portion of the opposition side at cooling fan, cooling air also can flow into the inside of the cylinder periphery wall portion of cooling fan opposition side, and further countercylinder carries out evenly cooling.
(5) by tunnel-like vent being divided into multiple little vents, can avoid the mechanical strength of the peripheral part that reduces tunnel-like vent.
(6) near the venting channels of cooling air the spark coil of configuration also can to utilize cooling air to carry out cooling.
Claims (7)
1. the cylinder cooling apparatus of an air cooled engine, an end at bent axle arranges cooling fan, with the cylinder periphery wall portion of the orthogonal side of the axle direction of described bent axle, be formed on the intake valve that keeps arranged spaced on the axle direction of described bent axle with and the pair of push rods inserting hole used of exhaust valve
Possess the described cooling fan of covering, cover the fan guard of the cylinder periphery wall portion that forms described push rod inserting hole simultaneously,
Make ventilation notch part that cylinder periphery wall portion between described pair of push rods inserting hole forms with
The cylinder periphery wall portion between push rod inserting hole and the cylinder thorax of described cooling fan one side of being disposed at forms, is communicated with to the tunnel-like vent of described ventilation notch part from the cylinder periphery wall portion of described cooling fan one side,
By the cooling air from described cooling fan, guide the cylinder periphery wall portion of the opposition side of described cooling fan into through described tunnel-like vent and ventilation notch part.
2. the cylinder cooling apparatus of air cooled engine according to claim 1, is characterized in that, the axle center of described cylinder tilts with respect to vertical direction.
3. the cylinder cooling apparatus of air cooled engine according to claim 1 and 2, is characterized in that, the push rod inserting hole that is disposed at described cooling fan one side is the push rod inserting hole that intake valve is used.
4. the cylinder cooling apparatus of air cooled engine according to claim 1 and 2, it is characterized in that, also possess and form in the cylinder periphery wall portion between push rod inserting hole and the cylinder thorax of opposition side that is disposed at described cooling fan, the tunnel-like vent of the cylinder periphery wall portion from described ventilation notch part to the opposition side of described cooling fan.
5. the cylinder cooling apparatus of air cooled engine according to claim 3, it is characterized in that, also possess and form in the cylinder periphery wall portion between push rod inserting hole and the cylinder thorax of opposition side that is disposed at described cooling fan, the tunnel-like vent of the cylinder periphery wall portion from described ventilation notch part to the opposition side of described cooling fan.
6. the cylinder cooling apparatus of air cooled engine according to claim 1 and 2, is characterized in that, described tunnel-like vent by the axis direction of described cylinder and multiple vents of row arrangement form.
7. the cylinder cooling apparatus of air cooled engine according to claim 3, is characterized in that, described tunnel-like vent by the axis direction of described cylinder and multiple vents of row arrangement form.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010239613A JP5525993B2 (en) | 2010-10-26 | 2010-10-26 | Cylinder cooling device for air-cooled engine |
| JP2010-239613 | 2010-10-26 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102454466A CN102454466A (en) | 2012-05-16 |
| CN102454466B true CN102454466B (en) | 2014-07-30 |
Family
ID=45971891
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110317959.4A Active CN102454466B (en) | 2010-10-26 | 2011-10-19 | Cylinder cooling apparatus for air-cooled engine |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US8770157B2 (en) |
| JP (1) | JP5525993B2 (en) |
| CN (1) | CN102454466B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5996480B2 (en) * | 2013-04-12 | 2016-09-21 | 本田技研工業株式会社 | Air-cooled engine for work equipment |
| US9617951B2 (en) * | 2014-05-06 | 2017-04-11 | Champion Engine Technology, LLC | Air flow guide for an internal combustion engine |
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| EP0279446A2 (en) * | 1987-02-19 | 1988-08-24 | Yamaha Motor Co., Ltd. | Air cooled internal combustion engine |
Also Published As
| Publication number | Publication date |
|---|---|
| JP5525993B2 (en) | 2014-06-18 |
| US20120097119A1 (en) | 2012-04-26 |
| CN102454466A (en) | 2012-05-16 |
| JP2012092699A (en) | 2012-05-17 |
| US8770157B2 (en) | 2014-07-08 |
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